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[InstCombine] try to narrow a truncated load
trunc (load X) --> load (bitcast X to narrow type) We have this transform in DAGCombiner::ReduceLoadWidth(), but the truncated load pattern can interfere with other instcombine transforms, so I'd like to allow the fold sooner. Example: https://bugs.llvm.org/show_bug.cgi?id=16739 ...in that report, we have bitcasts bracketing these ops, so those could get eliminated too. We've generally ruled out widening of loads early in IR ( LoadCombine - http://lists.llvm.org/pipermail/llvm-dev/2016-September/105291.html ), but that reasoning may not apply to narrowing if we can preserve information such as the dereferenceable range. Differential Revision: https://reviews.llvm.org/D64432 llvm-svn: 367011
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